关键词: 板材成形, 双面数控渐进成形, 背板, 成形质量

Abstract: Aiming at the problem of sheet parts deformation in unsupported suspension area of double sided Computer Numerical Control (CNC) incremental forming,a forming method of backing plate assisted double sided CNC incremental forming was proposed.The backing plate was used to support and restrain the non-ideal deformation of sheet's non-forming area,thereby improving the forming quality.The double sided CNC incremental forming strategy based on the backing plate for complex sheet parts,and the algorithm to automatically generate the required backplane CAD model for a given STL model were discussed.The STL model contour of the to-be-formed sheet parts according to their different types were extracted by the algorithm,and the backing plate CAD model was generated by vertex bias method.In addition,numerical simulation and actual forming experiments were used to validate and evaluate the proposed backing plate aided double sided CNC incremental forming method.Finite element analysis and experimental results showed that the use of backing plate in double sided CNC incremental forming could effectively improve the forming quality of formed sheet parts,which was feasible and applicable.

Key words: sheet forming, double sided computer numerical control incremental forming, backing plate, forming quality